棱镜6:RequestNavigate()只适用于一个区域

Question

我有三个区域：

<Grid>
    <DockPanel LastChildFill="True">
        <ContentControl  DockPanel.Dock="Top" prism:RegionManager.RegionName="{x:Static inf:
         RegionNames.TheUpperRegion}" Margin="5" />
        <ContentControl prism:RegionManager.RegionName="{x:Static inf:
         RegionNames.TheBottomRegion}" Margin="5"/>
    </DockPanel>
    <ContentControl prism:RegionManager.RegionName="{x:Static inf:RegionNames.TheWholeRegion}"
     Margin="5"  />
</Grid> 

此代码正确地从TheWholeRegion导航到TheBottomRegion区域：

Uri viewUpper = new Uri("ModuleItems", UriKind.Relative);
Uri viewBottom = new Uri("ModuleItems", UriKind.Relative);
regionManager.RequestNavigate(RegionNames.TheBottomRegion, viewBottom);
var loginView = regionManager.Regions[RegionNames.TheWholeRegion].Views.ElementAt(0);
regionManager.Regions[RegionNames.TheWholeRegion].Remove(loginView);

然而，如果我尝试同时加载两个区域，那么我会看到"System.Object"而不是Views:

Uri viewUpper = new Uri("ModuleItems", UriKind.Relative);
Uri viewBottom = new Uri("ModuleItems", UriKind.Relative);
regionManager.RequestNavigate(RegionNames.TheUpperRegion, viewUpper);
regionManager.RequestNavigate(RegionNames.TheBottomRegion, viewBottom);
var loginView = regionManager.Regions[RegionNames.TheWholeRegion].Views.ElementAt(0);
regionManager.Regions[RegionNames.TheWholeRegion].Remove(loginView); 

我做错了什么？

Answer 1

我需要的是在Unity容器中注册System.Object和视图类型之间的类型映射：

protected override void RegisterTypes()
{            
   Container.RegisterType<object, TheBottomControl>("ModuleItemsBottom");
   Container.RegisterType<IBottomViewModel, TheBottomControlViewModel>();
   Container.RegisterTypeForNavigation<TheBottomControl>();
   Container.RegisterType<object, TheUpperControl>("ModuleItemsUpper");
   Container.RegisterType<IUpperViewModel, TheUpperControlViewModel>();            
   Container.RegisterTypeForNavigation<TheUpperControl>();          
}

和要请求的代码：

Uri viewUpper = new Uri("ModuleItemsUpper", UriKind.Relative);
Uri viewBottom = new Uri("ModuleItemsBottom", UriKind.Relative);
regionManager.RequestNavigate(RegionNames.TheUpperRegion, viewUpper);
regionManager.RequestNavigate(RegionNames.TheBottomRegion, viewBottom);
var loginView = regionManager.Regions[RegionNames.TheWholeRegion].Views.ElementAt(0);
regionManager.Regions[RegionNames.TheWholeRegion].Remove(loginView);